TheIntrovertRin
they could possibly win if luffy decided to ask his mom to hit whitebeard with a surprise wave or water tentacle to nullify his devil fruit with the water then they could make it a battle of attrition and wait for whitebeards exertion to cause his illness to flare up before going for a decisive attack, but knowing luffy he would probably want to win on his own merits and would avoid actively asking her for help unless it became absolutely necessary, like if whitebeard suddenly decided to try and kill ace or sabo